Extech RF20 Handleiding

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USER GUIDE

Portable Salinity Refractometer with ATC

Model RF20

Introduction

Congratulations on your purchase of the Extech RF20

Handheld Salinity Refractometer with Automatic Temperature

Compensation. Precision optical instruments should be

handled gently; avoid touching the optical surface. Careful use

of this instrument will provide years of reliable service.

Description

1. Eyepiece

2. Mirror tube

3. Adjust screw

4. Cover plate

5. Prism

Field of view

Operation

The instrument measures the refractive index of the sample and

displays the result in parts per thousand (

0

/

00

) and specific

gravity (d

20

/

20

).

1. Zero Adjustment

Cover the prism with a few drops of distilled water from the

included vial. Close the cover plate and rotate the adjusting

screw so that the light/dark boundary line (known as the

shadow-line) evens up with the zero line. After the zero

adjustment, clean the prism with soft cloth.

2. Sample Preparation and Measurement Readings

To take a reading, place a few drops of a sample liquid on

the measurement prism. Ensure that enough solution is

added to the prism in order to cover the entire prism. Close

the prism so that the liquid spreads across the entire surface

of the prism without air bubbles or dry spots (see diagrams

below). Allow the sample to remain on the prism for

approximately 30 seconds.

While holding

the instrument

under a light

source, look

through the

eyepiece. The

salinity

concentration

is determined

by the

intersection of

the boundary

of the light and

dark fields

(known as the shadow-line) on the printed scale. The left

side of the scale indicates the specific gravity and the right

side parts per thousand. If the scale appears out of focus, the

eyepiece may be adjusted by rotating the knurled portion.

The instrument also features an eye guard to prevent stray

light from entering the eyepiece and causing reflections.

It may be necessary to adjust the position of the light source

to maximize the contrast of the shadow-line. Under normal

conditions, optimal contrast is obtained by holding the

instrument underneath and perpendicular to a light source.

Once a reading has been taken, wipe dry with a clean cloth

(do not wash or rinse) and place the instrument in the

supplied plastic case. Store the instrument in a safe, dry

environment.

3. Automatic Temperature Control (ATC)

Temperature is the single most important factor influencing

refractometer readings and is one of the largest sources of

measurement error. However, this device incorporates

automatic temperature compensation and the concern for

temperature fluctuations in sample liquids is alleviated. When

ambient temperature varies from 68°F (20°C), readings are

automatically adjusted to compensate for temperature

variance between 50°F to 86°F (10°C to 30°C).

Specifications

Scale Range Resolution

Parts Per Thousand 0 to 100

0

/

00

1

0

/

00

Specific Gravity 1.000 to 1.070 d

20

/

20

0.001 d

20

/

20

Dimensions: 7.6 x 1.5 x 1.5" (194 x 38 x 38mm)

Weight: Approx. 8.0 oz. (227g)

Calibration and Repair Services

FLIRSystems,Inc.offersrepairandcalibrationservicesforthe

ExtechInstrumentsproductswesell.NISTcertificationformost

productsisalsoprovided.CalltheCustomerService

Departmentforforinformationoncalibrationservicesavailable

thisproduct.Annualbecalibrationsshouldperformedtoverify

meterperformanceandandaccuracy.Technicalsupport

generalcustomerservicetheisalsoprovided,refertocontact

informationprovidedbelow.

Warranty

FLIRSystems,Inc.warrantsthisExtechInstrumentsbranddevicetobefreeof

defectsinpartsandworkmanshipforoneyearfromdateofshipment(asixmonth

limitedwarrantyappliestosensorsandcables).Ifitshouldbecomenecessaryto

returntheinstrumentforserviceduringorbeyondthewarranty

period,contact

thetheCustomerServiceDepartmentauthorization.forVisitwebsite

www.extech.comforcontactinformation.AReturnAuthorization(RA)number

mustbeissuedbeforeanyproductisreturned.Thesenderisresponsiblefor

shippingcharges,freight,insuranceandproperpackagingtopreventdamagein

transit.Thisapplywarrantydoesnot

todefectsfromresultingactionoftheuser

suchasmisuse,improperwiring,operationoutsideofspecification,improper

maintenanceororrepair,unauthorizedmodification.FLIRSystems,Inc.specifically

disclaimsanyimpliedwarrantiesmerchantabilityororfitnessforaspecific

purposeandbewillnotliableforanydirect,indirect,incidentalor

consequential

damages.FLIR’sliabilitytotalislimitedtorepairorofreplacementtheproduct.

Thewarrantysetforthaboveisinclusiveandnootherwarranty,whetherwritten

orororal,isexpressedimplied.

Copyright©20132015‐FLIRSystems,Inc.

Allrightsreservedincludingtherightoforreproductioninwholeininpartany

form

www.extech.com

1

5

4

3

2

SupportLines:U.S.(877)4398324;3247800‐International:+1(603)‐

TechnicalSupport:Option3;‐Email:[email protected]

Repair&Returns:Option4;‐Email:repair@extech.com

Productspecificationsaresubjecttochangewithoutnotice

Pleasevisitmostourwebsitefortheup‐to‐dateinformation

www.extech.com

FLIRCommercialSystems,Inc.,9

TownsendWest,Nashua,NH03063USA

ISO9001Certi

f

ied

Product specificaties